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From: "gjl at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/49687] [4.6 Regression][avr] Missed optimization for widening MUL
Date: Fri, 29 Jul 2011 11:50:00 -0000	[thread overview]
Message-ID: <bug-49687-4-MyKarrDheb@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-49687-4@http.gcc.gnu.org/bugzilla/>

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49687

--- Comment #7 from Georg-Johann Lay <gjl at gcc dot gnu.org> 2011-07-29 11:49:30 UTC ---
With this milestone the work for better support for widening multiplication is
finished -- fir the case when MUL instruction is available.

Similar work for the case when no hardware multiplier is available needs still
to be done.

The preferred approach in that case is to do the extension explicitely in
libgcc prior to the multiplication.  Respective code was already included in
libgcc but dead because no one calls it up to now.


  parent reply	other threads:[~2011-07-29 11:50 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-07-09  9:36 [Bug target/49687] New: AVR: " gjl at gcc dot gnu.org
2011-07-09  9:37 ` [Bug target/49687] " gjl at gcc dot gnu.org
2011-07-09  9:39 ` gjl at gcc dot gnu.org
2011-07-14 18:43 ` eric.weddington at atmel dot com
2011-07-14 18:45 ` [Bug target/49687] [4.6 Regression][avr] " eric.weddington at atmel dot com
2011-07-20 17:25 ` gjl at gcc dot gnu.org
2011-07-28  8:03 ` gjl at gcc dot gnu.org
2011-07-29 11:28 ` gjl at gcc dot gnu.org
2011-07-29 11:50 ` gjl at gcc dot gnu.org [this message]
2011-08-11  7:51 ` gjl at gcc dot gnu.org
2011-08-11 21:45 ` gjl at gcc dot gnu.org
2011-09-09 18:09 ` gjl at gcc dot gnu.org

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